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+/** @file
+ * Base class for an host-guest service.
+ */
+
+/*
+ * Copyright (C) 2011-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef VBOX_INCLUDED_HostServices_Service_h
+#define VBOX_INCLUDED_HostServices_Service_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <memory> /* for auto_ptr */
+
+#include <VBox/log.h>
+#include <VBox/hgcmsvc.h>
+
+#include <iprt/assert.h>
+#include <iprt/alloc.h>
+#include <iprt/cpp/utils.h>
+
+
+namespace HGCM
+{
+
+/**
+ * Structure for keeping a HGCM service context.
+ */
+typedef struct VBOXHGCMSVCTX
+{
+ /** HGCM helper functions. */
+ PVBOXHGCMSVCHELPERS pHelpers;
+ /*
+ * Callback function supplied by the host for notification of updates
+ * to properties.
+ */
+ PFNHGCMSVCEXT pfnHostCallback;
+ /** User data pointer to be supplied to the host callback function. */
+ void *pvHostData;
+} VBOXHGCMSVCTX, *PVBOXHGCMSVCTX;
+
+/**
+ * Base class encapsulating and working with a HGCM message.
+ */
+class Message
+{
+public:
+
+ Message(void);
+
+ Message(uint32_t uMsg, uint32_t cParms, VBOXHGCMSVCPARM aParms[]);
+
+ virtual ~Message(void);
+
+ uint32_t GetParamCount(void) const;
+
+ int GetData(uint32_t uMsg, uint32_t cParms, VBOXHGCMSVCPARM aParms[]) const;
+
+ int GetParmU32(uint32_t uParm, uint32_t *pu32Info) const;
+
+ int GetParmU64(uint32_t uParm, uint64_t *pu64Info) const;
+
+ int GetParmPtr(uint32_t uParm, void **ppvAddr, uint32_t *pcbSize) const;
+
+ uint32_t GetType(void) const;
+
+public:
+
+ static int CopyParms(PVBOXHGCMSVCPARM paParmsDst, uint32_t cParmsDst,
+ PVBOXHGCMSVCPARM paParmsSrc, uint32_t cParmsSrc,
+ bool fDeepCopy);
+
+protected:
+
+ int initData(uint32_t uMsg, uint32_t cParms, VBOXHGCMSVCPARM aParms[]);
+
+ void reset();
+
+protected:
+
+ /** Stored message type. */
+ uint32_t m_uMsg;
+ /** Number of stored HGCM parameters. */
+ uint32_t m_cParms;
+ /** Stored HGCM parameters. */
+ PVBOXHGCMSVCPARM m_paParms;
+};
+
+/**
+ * Class for keeping and tracking a HGCM client.
+ */
+class Client
+{
+public:
+
+ Client(uint32_t uClientID);
+
+ virtual ~Client(void);
+
+public:
+
+ int Complete(VBOXHGCMCALLHANDLE hHandle, int rcOp = VINF_SUCCESS);
+
+ int CompleteDeferred(int rcOp = VINF_SUCCESS);
+
+ uint32_t GetClientID(void) const;
+
+ VBOXHGCMCALLHANDLE GetHandle(void) const;
+
+ uint32_t GetMsgType(void) const;
+
+ uint32_t GetMsgParamCount(void) const;
+
+ uint32_t GetProtocolVer(void) const;
+
+ bool IsDeferred(void) const;
+
+ void SetDeferred(VBOXHGCMCALLHANDLE hHandle, uint32_t u32Function, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
+
+ void SetProtocolVer(uint32_t uVersion);
+
+ void SetSvcContext(const VBOXHGCMSVCTX &SvcCtx);
+
+public:
+
+ int SetDeferredMsgInfo(uint32_t uMsg, uint32_t cParms);
+
+ int SetDeferredMsgInfo(const Message *pMessage);
+
+protected:
+
+ int completeInternal(VBOXHGCMCALLHANDLE hHandle, int rcOp);
+
+ void reset(void);
+
+protected:
+
+ /** The client's HGCM client ID. */
+ uint32_t m_uClientID;
+ /** Optional protocol version the client uses. Set to 0 by default. */
+ uint32_t m_uProtocolVer;
+ /** The HGCM service context this client is bound to. */
+ VBOXHGCMSVCTX m_SvcCtx;
+ /** Flag indicating whether this client currently is deferred mode,
+ * meaning that it did not return to the caller yet. */
+ bool m_fDeferred;
+ /** Structure for keeping the client's deferred state.
+ * A client is in a deferred state when it asks for the next HGCM message,
+ * but the service can't provide it yet. That way a client will block (on the guest side, does not return)
+ * until the service can complete the call. */
+ struct
+ {
+ /** The client's HGCM call handle. Needed for completing a deferred call. */
+ VBOXHGCMCALLHANDLE hHandle;
+ /** Message type (function number) to use when completing the deferred call. */
+ uint32_t uType;
+ /** Parameter count to use when completing the deferred call. */
+ uint32_t cParms;
+ /** Parameters to use when completing the deferred call. */
+ PVBOXHGCMSVCPARM paParms;
+ } m_Deferred;
+};
+
+template <class T>
+class AbstractService: public RTCNonCopyable
+{
+public:
+ /**
+ * @copydoc VBOXHGCMSVCLOAD
+ */
+ static DECLCALLBACK(int) svcLoad(VBOXHGCMSVCFNTABLE *pTable)
+ {
+ LogFlowFunc(("ptable = %p\n", pTable));
+ int rc = VINF_SUCCESS;
+
+ if (!VALID_PTR(pTable))
+ rc = VERR_INVALID_PARAMETER;
+ else
+ {
+ LogFlowFunc(("ptable->cbSize = %d, ptable->u32Version = 0x%08X\n", pTable->cbSize, pTable->u32Version));
+
+ if ( pTable->cbSize != sizeof (VBOXHGCMSVCFNTABLE)
+ || pTable->u32Version != VBOX_HGCM_SVC_VERSION)
+ rc = VERR_VERSION_MISMATCH;
+ else
+ {
+ RT_GCC_NO_WARN_DEPRECATED_BEGIN
+ std::auto_ptr<AbstractService> apService;
+ /* No exceptions may propagate outside. */
+ try
+ {
+ apService = std::auto_ptr<AbstractService>(new T(pTable->pHelpers));
+ } catch (int rcThrown)
+ {
+ rc = rcThrown;
+ } catch (...)
+ {
+ rc = VERR_UNRESOLVED_ERROR;
+ }
+ RT_GCC_NO_WARN_DEPRECATED_END
+ if (RT_SUCCESS(rc))
+ {
+ /*
+ * We don't need an additional client data area on the host,
+ * because we're a class which can have members for that :-).
+ */
+ pTable->cbClient = 0;
+
+ /* These functions are mandatory */
+ pTable->pfnUnload = svcUnload;
+ pTable->pfnConnect = svcConnect;
+ pTable->pfnDisconnect = svcDisconnect;
+ pTable->pfnCall = svcCall;
+ /* Clear obligatory functions. */
+ pTable->pfnHostCall = NULL;
+ pTable->pfnSaveState = NULL;
+ pTable->pfnLoadState = NULL;
+ pTable->pfnRegisterExtension = NULL;
+
+ /* Let the service itself initialize. */
+ rc = apService->init(pTable);
+
+ /* Only on success stop the auto release of the auto_ptr. */
+ if (RT_SUCCESS(rc))
+ pTable->pvService = apService.release();
+ }
+ }
+ }
+
+ LogFlowFunc(("returning %Rrc\n", rc));
+ return rc;
+ }
+ virtual ~AbstractService() {};
+
+protected:
+ explicit AbstractService(PVBOXHGCMSVCHELPERS pHelpers)
+ {
+ RT_ZERO(m_SvcCtx);
+ m_SvcCtx.pHelpers = pHelpers;
+ }
+ virtual int init(VBOXHGCMSVCFNTABLE *ptable) { RT_NOREF1(ptable); return VINF_SUCCESS; }
+ virtual int uninit() { return VINF_SUCCESS; }
+ virtual int clientConnect(uint32_t u32ClientID, void *pvClient) = 0;
+ virtual int clientDisconnect(uint32_t u32ClientID, void *pvClient) = 0;
+ virtual void guestCall(VBOXHGCMCALLHANDLE callHandle, uint32_t u32ClientID, void *pvClient, uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[]) = 0;
+ virtual int hostCall(uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[])
+ { RT_NOREF3(eFunction, cParms, paParms); return VINF_SUCCESS; }
+
+ /** Type definition for use in callback functions. */
+ typedef AbstractService SELF;
+ /** The HGCM service context this service is bound to. */
+ VBOXHGCMSVCTX m_SvcCtx;
+
+ /**
+ * @copydoc VBOXHGCMSVCFNTABLE::pfnUnload
+ * Simply deletes the service object
+ */
+ static DECLCALLBACK(int) svcUnload(void *pvService)
+ {
+ AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
+ SELF *pSelf = reinterpret_cast<SELF *>(pvService);
+ int rc = pSelf->uninit();
+ AssertRC(rc);
+ if (RT_SUCCESS(rc))
+ delete pSelf;
+ return rc;
+ }
+
+ /**
+ * @copydoc VBOXHGCMSVCFNTABLE::pfnConnect
+ * Stub implementation of pfnConnect and pfnDisconnect.
+ */
+ static DECLCALLBACK(int) svcConnect(void *pvService,
+ uint32_t u32ClientID,
+ void *pvClient,
+ uint32_t fRequestor,
+ bool fRestoring)
+ {
+ RT_NOREF(fRequestor, fRestoring);
+ AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
+ LogFlowFunc(("pvService=%p, u32ClientID=%u, pvClient=%p\n", pvService, u32ClientID, pvClient));
+ SELF *pSelf = reinterpret_cast<SELF *>(pvService);
+ int rc = pSelf->clientConnect(u32ClientID, pvClient);
+ LogFlowFunc(("rc=%Rrc\n", rc));
+ return rc;
+ }
+
+ /**
+ * @copydoc VBOXHGCMSVCFNTABLE::pfnConnect
+ * Stub implementation of pfnConnect and pfnDisconnect.
+ */
+ static DECLCALLBACK(int) svcDisconnect(void *pvService,
+ uint32_t u32ClientID,
+ void *pvClient)
+ {
+ AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
+ LogFlowFunc(("pvService=%p, u32ClientID=%u, pvClient=%p\n", pvService, u32ClientID, pvClient));
+ SELF *pSelf = reinterpret_cast<SELF *>(pvService);
+ int rc = pSelf->clientDisconnect(u32ClientID, pvClient);
+ LogFlowFunc(("rc=%Rrc\n", rc));
+ return rc;
+ }
+
+ /**
+ * @copydoc VBOXHGCMSVCFNTABLE::pfnCall
+ * Wraps to the call member function
+ */
+ static DECLCALLBACK(void) svcCall(void * pvService,
+ VBOXHGCMCALLHANDLE callHandle,
+ uint32_t u32ClientID,
+ void *pvClient,
+ uint32_t u32Function,
+ uint32_t cParms,
+ VBOXHGCMSVCPARM paParms[],
+ uint64_t tsArrival)
+ {
+ AssertLogRelReturnVoid(VALID_PTR(pvService));
+ LogFlowFunc(("pvService=%p, callHandle=%p, u32ClientID=%u, pvClient=%p, u32Function=%u, cParms=%u, paParms=%p\n", pvService, callHandle, u32ClientID, pvClient, u32Function, cParms, paParms));
+ SELF *pSelf = reinterpret_cast<SELF *>(pvService);
+ pSelf->guestCall(callHandle, u32ClientID, pvClient, u32Function, cParms, paParms);
+ LogFlowFunc(("returning\n"));
+ RT_NOREF_PV(tsArrival);
+ }
+
+ /**
+ * @copydoc VBOXHGCMSVCFNTABLE::pfnHostCall
+ * Wraps to the hostCall member function
+ */
+ static DECLCALLBACK(int) svcHostCall(void *pvService,
+ uint32_t u32Function,
+ uint32_t cParms,
+ VBOXHGCMSVCPARM paParms[])
+ {
+ AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
+ LogFlowFunc(("pvService=%p, u32Function=%u, cParms=%u, paParms=%p\n", pvService, u32Function, cParms, paParms));
+ SELF *pSelf = reinterpret_cast<SELF *>(pvService);
+ int rc = pSelf->hostCall(u32Function, cParms, paParms);
+ LogFlowFunc(("rc=%Rrc\n", rc));
+ return rc;
+ }
+
+ /**
+ * @copydoc VBOXHGCMSVCFNTABLE::pfnRegisterExtension
+ * Installs a host callback for notifications of property changes.
+ */
+ static DECLCALLBACK(int) svcRegisterExtension(void *pvService,
+ PFNHGCMSVCEXT pfnExtension,
+ void *pvExtension)
+ {
+ AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
+ LogFlowFunc(("pvService=%p, pfnExtension=%p, pvExtention=%p\n", pvService, pfnExtension, pvExtension));
+ SELF *pSelf = reinterpret_cast<SELF *>(pvService);
+ pSelf->m_SvcCtx.pfnHostCallback = pfnExtension;
+ pSelf->m_SvcCtx.pvHostData = pvExtension;
+ return VINF_SUCCESS;
+ }
+
+ DECLARE_CLS_COPY_CTOR_ASSIGN_NOOP(AbstractService);
+};
+
+}
+#endif /* !VBOX_INCLUDED_HostServices_Service_h */
+
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